521667248520 has 128 divisors (see below), whose sum is σ = 1743599831040. Its totient is φ = 123774032640.

The previous prime is 521667248497. The next prime is 521667248521. The reversal of 521667248520 is 25842766125.

It is a self number, because there is not a number n which added to its sum of digits gives 521667248520.

It is not an unprimeable number, because it can be changed into a prime (521667248521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4142242 + ... + 4266321.

It is an arithmetic number, because the mean of its divisors is an integer number (13621873680).

Almost surely, 2^521667248520 is an apocalyptic number.

It is an amenable number.

521667248520 is an abundant number, since it is smaller than the sum of its proper divisors (1221932582520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521667248520 is a wasteful number, since it uses less digits than its factorization.

521667248520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8408635 (or 8408631 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 521667248520 in words is "five hundred twenty-one billion, six hundred sixty-seven million, two hundred forty-eight thousand, five hundred twenty".